Burglar-alarm



(No Model.)

J. M. KRAMER.

V V BURGLAR ALARM. No. 601,150.

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Patented Mar. 22, 1898 U ITED ,STATEs;

PATENT OFFICE.

' JOHN KRAMER, OF ATHENS, PENNSYLVANIA.

BU RG LAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 601,150, dated March22, 1898.

Application filed May 20, 1897.

To all whom it may concern:

Be it known that I, JOHN M. KRAMER, a citizen of the United States,residing at Athens,

in-the county of Bradford and State of Pennsylvania, have invented anewand useful Burglar-Alarm, of which the following is a specification.1

The invention relates to improvements in burglar-alarms.

The object of the present invention is to improve the construction ofburglar-alarms and to provide a simple, inexpensive, and efficient one,designed to be mounted on a door-frame to be operated by the opening ofthe door and capable when the door is opened of discharging a cartridgeand firing a ball at the intruder.

The invention consistsin the construction and attaching the barrel to adoor-casing.

- its breech for the reception of the pin 4 of the cartridge, and thelatter is retained in the barrel by a breech-plate 5. The breech-plate5, which is connected with the barrel by a pivot 6, is provided at oneside with an ear and at the other side with a hook 7, adapted to engagea headed stud 8, which preferably consists of a screw mounted on therear end of the barrel at one side thereof, as clearly illustrated inFig. 2 of the accompanying drawings. The barrel isslightly enlarged atthe breech to receive the screw 8 and the Serial No. 6 3 7,3 9 8. (Nomodel.)

screw 6, which passes through the ear of the breech-plate.

The barrel is mounted on a door-casing by a support consisting of athreadedshank or screw 9 and a circular strap 10, adapted to embrace thebarrel at the muzzle thereof and pivoted to an ear 11 of the threadedshank or screw. The threaded shank or screw is provided with a head 12,which is perforated to receive the pivot of an oscillating yoke 13, andthe inner side 14 of the head conforms to the configuration of thebarrel, and it is provided with a projection 15, which fits in a recessof the same.

The yoke 13, which straddles the barrel, engages one leg of a combinedmainspring and hammer 16, which is substantially V- shaped and which hasits inner leg 17 curved at the end and engaging a recess 18 of thebarrel. The other leg is provided with a notch 19, which receives theouter end of the yoke, and the apex or head of the spring is adapted toengage the projecting portion of the pin 4 and discharge the cartridge,as clearly illustrated in Fig. 1 of the accompanying drawings.

The device is mounted on a door-casing by partially embedding the screwin the same, and the barrel, which is arranged at a slight angle to thedoor, fits against the head 12 and is supported by the strap 10, beingdirected toward the door-opening in order to direct the ball of thecartridge toward an intruder. The strap firmly holds the barrel on thescrew in a fixed position and enables the device to be properly aimed,so that a person attempting to force his way into a room will be struckby the bullet. The spring is swung to a position substantially at rightangles to the barrel, but little beyond the perpendicular, and it iscompressed when in this position, as illustrated in dotted lines in Fig.l. The spring is arranged to be engaged by the door in opening and isthrown over the center by the same, whereby it is caused to strike thepin and discharge the cartridge.

It will be seen that the device is exceedingly simple and inexpensive inconstruction, that the parts are adapted to be folded compactly, so thatit can be conveniently carried,

and that it is capable of being readily mounted on a door-casing. Itwill also be apparent that it is adapted to fire a ball in the directionof an intruder besides sounding an alarm to wake the occupants of aroom.

hat I claim is A device of the class described comprising a barrel, ascrew engaging the barrel and forming a support for the same, a strapmounted on the screw at a point between the ends thereof and encirclingthe muzzle of the barrel, whereby the barrel is firmly held on the screwin a fixed position, an oscillating yoke straddling the barrel andpivoted to the screw, and a substantially V-shaped spring having one legfulcrumed on the barrel and its other leg connected with the yoke, saidspring constituting a hammer for discharging a cartridge and adapted tobe actuated by a door, substantially as described.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

JOHN M. KRAMER.

\Vitnesses:

W. II. FRENCH, A. II. MILLER.

